The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
The fastest rotated speed of principal axis motor of optical disc driver has reached about 12000rpm nowadays.
现今光盘驱动器主轴马达的最高转速约为每分钟12000转。
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